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  1. kellys_eye

    Tektronix TDS3054 data acquisition failure

    ...which, to me, points to the DISPLAY circuitry (it being a fixed period, raster scan type of thing - SVGA?) Is there any way to get the video on an external port or access the video signal from some internal take-off point?
  2. kellys_eye

    Will bad/old batteries cause my controller to malfunction?

    Separate the batteries and check them individually. One bad battery can pull the rest of the bank down.
  3. kellys_eye

    Remote control circuit of old TV?

    You will have to show pictures of all the boards for us to determine if remote control circuitry is in that set.
  4. kellys_eye

    Small print

    I use a combination of devices - the good old reading glasses, magnifying lens and, on occasion, a webcam retrofitted with a macro lens. Some chips also benefit from smearing (using the smallest amount possible) with white thermal paste that 'sticks' to the lasered-on etching identification...
  5. kellys_eye

    Tektronix TDS3054 data acquisition failure

    The 'interference' has a periodic value - can you associate that with any clock or timing within the device? Does it change with range? Strange(ish) how it's only on the red signal line too - post D-A conversion?
  6. kellys_eye

    RC Car Repair.....Battlebot chasis

    Is there a tab like the one shown in this picture but with some reside of solder left on it? The black wire is probably the battery negative supply lead that has come away from the battery compartment somewhere.
  7. kellys_eye

    DayRad type 880 set analyzer (Tube Tester )

    I've used this guy to get schematics in the past - as his advert says, cheapest on the web and he's quick too https://thecodemachine.co.uk/Schematics/Search.php?manuf=DayRad&model=dayrad%20880
  8. kellys_eye

    Programming PIC to sontrol 6x SERVOs

    Here's a good primer on servo timing control. Hope it helps: https://www.princeton.edu/~mae412/TEXT/NTRAK2002/292-302.pdf
  9. kellys_eye

    Programming PIC to sontrol 6x SERVOs

    You need only develop a timing routine that takes a parameter you 'send' and incorporates it to the 'size' of the delay. i.e. if you decide on a maximum position accuracy of 1/255th of a (swing of the servo rotor) rotation then send a number between 00 and FF to be included in a timer routine...
  10. kellys_eye

    Velleman Pic programmer k4048 issue

    No problem - I think it may have something to do with WinXP and it's relatively slow access to the serial port (could be talking BS here! but I think there are similar issues accessing the serial port when using Visual Basic) as the same software seems to work just fine on a more powerful PC...
  11. kellys_eye

    Velleman Pic programmer k4048 issue

    ISTR there was an issue with the speed at which the writing process was done. Is there a setting by which this can be reduced?
  12. kellys_eye

    Cant find any info CQ108 ???

    Pop over to the Didikey website and use the parametric search facility to find a triac with at least a 400V rating and (say) 20A current handling capability. You will be shown a list of suitable parts, from which you can choose one that has the best chances of a physical mounting. You may need...
  13. kellys_eye

    Remote control circuit of old TV?

    Are there three pins coming out of the 'tin box' that will connect to the 3-pin socket seen in the picture? Show more pictures. Different angles etc.
  14. kellys_eye

    IR Led with Boost Converter

    The digital signal from the Arduino will feed to the base of a transistor via a current limiting resistor. The LED will fit in the collector circuit of the transistor with a current limiting resistor connected to whatever DC supply you care to use. Note that the use of a single transistor in...
  15. kellys_eye

    IR Led with Boost Converter

    Just use a buffering device (transistor or MOSFET) to switch the IR LED. You can then apply shorter, higher power pulses to the device.
  16. kellys_eye

    Remote control circuit of old TV?

    The small 'tin can' module is common for IR receivers, housing the sensor that often contains the pre-amp and signal conditioning circuitry (but not always). Follow the wire that comes from that tin can and show a picture of the circuit board that it connects to.
  17. kellys_eye

    Cant find any info CQ108 ???

    You can switch a triac on with an AC signal but are you sure the signal you are measuring is AC and not a simple pulsed DC? Either way any conventional device (suitably rated of course) would probably be a decent replacement.
  18. kellys_eye

    Decent Equip

    The market is 'flooded' with good value meters right now and all the 'talk' is around the Aneng range where, if you get this model, you can't really go wrong and at $20 delivered(!) yo won't find better value. https://www.markhennessy.co.uk/budget_multimeters/aneng_an8002.htm
  19. kellys_eye

    Replace old transformer with rectifier bridge

    You might find that there is a thermal fuse fitted against the transformer windings. Look for a 'bulge' under the tape and, working carefully so you don't cut any of the winding wires, you might be able to get the fuse out and replace it.
  20. kellys_eye

    Cant find any info CQ108 ???

    What makes you think 8A is wrong (for the running AC unit?). Is there an actual fault with it? Most motor-driven items require a larger starting current than running current and the use of a 20A breaker is consistent with the 'in-rush' current requirement else a smaller-rated breaker would...
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